The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 18, 1992
Filed:
Sep. 23, 1991
Donald J Legatt, St. Michael, MN (US);
Advance Machine Company, Plymouth, MN (US);
Abstract
A dust collection/control system is disclosed utilized in a floor polishing machine (10) according to the most preferred form of the present invention. The floor polishing machine (10) includes a rotating working member in the form of a polishing member (16) for maintaining a floor surface as it is moved along the floor. The polishing member (16) is located and rotated within a housing or shield (186) including a circular, planar portion (92) terminating at its periphery in a downwardly extending flange (94) including a flexible skirt (95) which engages the floor. The rotation of the polishing member (16) within the housing (186) passively generates an air current contained within the housing (186). The air current engages first and second air barriers (190) which extend downwardly from the planar portion (92) and generally radially inwardly from the flange (94) to create a high pressure area upstream of the air barriers (190) with high pressure air being allowed to escape through an air outlet (188) into a filter and collection bag (148) and to create a vacuum downstream of the air barriers (190) to draw air around the skirt (95) to entrain the dust and air in the circling air current.